Internal-combustion engine



April 2s, 1925. l i 1,535,423

I C. LATTA INTERNAL COMBUSTION ENGINE Filed may 2s. 1923 2 sheets-sheet 1 April 28, 1925.

' Y 1,535,423 C. LATTA INTERNAL COMBUSTION ENGINE Fldy 2 8. 1923 2 Sheets-Sheet 2 Q n k Q2 i n] N v l u* fz, H IFI b' N bk Q N a ing the relationship Patented Apr. 28, 1925.

CHARLES' LATTA, or sa'. LoU'Is, mssouar.

PATENT oFFicE.

INTERNAL-COMBUSTION ENGINE.

Appiica'aon mea May as, i923. serial No. 641,849.

To all 'who/ft it may cmi-cem.

Be it known that citizen of the United city of St. Louis, Missouri.

I, CHARLES LA'i'rA, a States, residing'at the have invented a ne\v and useful Internal-Combustion Engine, of which the following is a specification.

This invention relates to internal combustion engines, and an object is to provide an improvedy mechanism passage of gas to the engine cylinders andl for controlling the the exhaust therefrom.

Another object of the invention is to provide a novel and improved valve mechanism and meansfor operating the same to obtain the desired and beneficial results hereinafter disclosed.

Another object of the invention is to provide an improved valve comprising a pair,

of -cooperating. valve elements having a novel. construction and relationship; andv means for operating them so that they will control the admission vice and the passage ump device to the W Another object of of gas to a pump deof the gas from the orking cylinder.

the inventiony is to pro.-

vide an improved valveconstructed and arranged as last above stated, and in addition 'to .provide means whereby the operation of `the valve Will force clean working cylinder for Other objects will appear air through the scavenging purposes.

from the following description and the annexed drawings,

in Which Fig. 1 isa horizontal sectional view showof the pump and piston cylinders and the valve which controls the admission of gas to the of gas from the pump to the Working cyli'nderand the forcing of air through the Working cylinder for scavenging purposes.

F ig. 2 is a vertical longitudinal sectional view showing the construction and arrangement of the valve, and r parte when the workingcylinder is receivfrom the pump, the working piston ing gas being on the upward 3 is a sectional to the section of Fig. 2,

the valve cylinder.

Fig. 4 is a sectional the parts being from a carburetor.

Fig. 5 1s a sectiona the position of the stroke. n

view at right angles being taken through view similar to Fig. 2,

shown in the position in which gas is being admitted to the pump l View similar to Fig.

pump, theA passage ly mounted in positions crank shaft 3 by a piston rod 7 and a valve cylinder 8 located between the Working and pump cylinders and containing valve mechanism operated by the crank shaft 3 to control the admission of gas to the pump cylinder, the ypassage of gas from the pump cylinder to the Working cylinder, and the forcing of air through the Working cylinder for scavenging purposes.

A gas inlet passage 9 (Figs. 1, 4 and 5)l opens into the valve c` linde-1' 8 and a port 10 forms a communication betvveenthe valve cylinder 8 and the pump cylinder 5 and serves the double purpose of admitting gas into the pump cylinder from the passage 9 and permitting the gas to be'forced out of the pu'mp'cylinder through the valve device into the working piston cylinder. A passage 1.1 opens from the valve cylinder into the Working piston cylinder.

A sliding sleeve valve member 12 operates Within the valve cylinder and is restricted by an eccentric 13 on the crank shaft 3 and a connection 14 from said eccentric to said sleeve. y registers with the passage 9 at the same time that a similar p0rt16 registers with the port 10 in order to admit, gas into the pump cyl inder (Figs. 4 and 5). When the gas is being taken into theppump cylinder the port 11 is closed by the sleeve 12. The sleeve 12 has a p/ort 17 that is brought into registration with the port 10 at the same time that a similar port 1118 in the sleeve is brought into registratioi with the port 11 for the purpose of permitting the gas to be forced from the pump cylinderinto the Working piston cylinder (Fig. 2).

A cooperating valve member is operativethe sleeve 12, the same comprising a body 19 having a piston head 20 united with the upper end thereof by a reduced connection 21 leaving an annular space between the end of the body 19 and the piston head 20. The piston head 20 is preferably equipped with an expanding piston ring 22 to form a seal to prevent passage of gas around the piston head. The

valve member now being considered is operated `by connections from the crank shaft 3,

` a lcheck valve 30 of a .mechanism controlling the said connections comprising an eccentric 23 and a connection 24 therefrom to the body 19. )Vhen the sleeve 12 is in the positionI to admit gas from the passage 9 to the pump cylinder 5 through the ports 15 and 16, the valve member 19 is in position to permit the passage of the gas through the annular space between the upper end of the body 19 and the piston head 20 Figs. 4 and 5).

The valve member 19 has a passage 25 therethrough which registers with the ports 17 and 18 when said ports register with the ports l0 and 11, thereby permitting the gas to pass from the pump cylinder to the working cylinder (Fig. 2). The operating connections for the sleeve valve member 12 and the valve member 19 are arranged in a relationship to'eil'ect relative movement of said valve members to obtain the. positions shown so that (Fig. 2) when the gas is passing from the pump cylinder to the working cyl inder the lpassage 9 is closed; and when gas is being taken into the pump cylinder (Figs. 4 and 5) the ports 11, 17, 18 and 25 are closed; and when the workingycylinder is exhausting and being scavenged the passage 9 is closed by the sleeve 12 and the ports 17 and`18 are closed by the valve member 19 (Fig. 6).

The valve cylinder 8' is provided with an air inlet pipe 26 equipped with a check valve 27 of a typeto permit air to be drawn into the valve cylinder and to prevent air from` being forced from the valve cylinder through said pipe 26. A pipe 28 has one end opening into the valve cylinder 8 and the other end opening into the working cylinder 1, as shown at 29, (Fig. 6) and is equipped with type to permit air to be forced from the valve cylinder and yto prevent air from being drawn therethrough into the valve cylinder. Thus, the valve intake of gas also functions as a pump device to force air'into the working cylinder across the upper end of the piston 2 and these parts are arra-nged in such relationship that a jet of lfresh air is forced into the working cylinder at the time that exhaust is taking place. This serves to scavenge the working cylinder and piston and maintain them in a clean condition. During the scavenging of the working cylinder,

' member 19 occupy positions to close the intake passage 9 and to close communication between the pump' cylinder 'and the working cylinder (Fig. 6).

From the foregoing it will be seen that the sleeve 12 and the valve" acter and that itobtains all of its intended objects efficiently and satisfactorily. The shape and the dimensions of the parts are comparatively unimportant, though, preferably the ports17 and 1.8 are restricted in comparison with the ports 10 and 11 inorder to force the gas through restricted passage into the working cylinder.

I contemplate such variations in the construction and arrangement as may be deemed expedient to obtain best results in particu lar cases, and I do not restrict myself un; essentially in any particular.

What I claim and desire to secure by Letters Patent is 1. In an engine, the combination with a working cylinder and a pump cylinder, of a valve comprising a slidin sleeve, a separate valve member mounted for rclative'sliding movements in the sleeve, and means for operating said sleeve and said valve member to' contro the passage of gas tothe pump cylinder and the passage of gas from the pump cylinder to the working cylinder.

2. In an engine, the combination with a worklng cylinder and a pump cylinder, of a valve comprising a' sliding sleeve, a separate valve member mountedfor relative sliding movements in the sleeve, and means for operating said sleeve and said valve member to control the passage of gas to the pump cylinder and the passage of gas from the pump cylinder to the working cylinder and t0 force fresh. air into the working cylinder 100 durin exhaust. v v

3. n an engine, the combination of a working cylinder' having an inlet port, a pump cylinder having a port opening into it, a valve' cylinder having a port opening 105 into it, a sleeve mounted for sliding movements in the valve cylinder having ports for registration with the first-named three ports respectively, a valve member mounted for relative sliding movements in the sleeve and 110 having a port for communication with two of the ports in the sleeve when said two ports are in communicatiop witlr the ports opening into the working cylinder and the pump cylinder, and means for operating said sleeve 115 Zand said valve member to effect the registration of said ports asv aforesaid and also to' close said ports'. v

4c. In an engine, the combination of a working cylinder having an inlet port, a 120 pump cylinder having a port opening into it,

my invention is of 4a highly eilicient char- .a valve cylinder having a port opening into working cylinder.

5. In an engine, a working cylinder, a pump cylinder, a valve cylinder between the working and -pump cylinders and having ports' opening into said'cylinders, a sleeve mounted in the valve cylinder having ports. adapted to be brought into and out of registration vwith the orts opening into said cylinders rcspectiveiy., and a valve member mounted for relative sliding movements in said sleeve and having a passage therethrough adapted to be brought into and out of registration with certain of the ports in said sleeve, and means for operating said sleeve and said valve member for said purposes.

G. In an engine, a Working cylinder, a pump cylinder, a valve cylinder between the working and pump cylinders and having ports opening into said cylinders, a sleeve mounted in the valve cylinder having ports adapted to be brought into and out of registration with the ports opening into said cylinders respectively, a valve member mounted for relative sliding movements in said sleeve and having a passage therethrough adapted to be brought into and 'out of registration with certain of thc ports in said sleeve, means for operating said sleeve and said valve member for said purposes, and an air pump device ope ated by said valve member for forcing air into the Working cylinder during exhaust.

7. In an engine.. a working cylinder, a valve cylinder 'having a port opening into the working cylinder, a pair of relatively movable valve elements in the valve cylinder controlling the passage of gas through said ports into the working cylinder, and means operated by said valve elements for forcing air through the working cylinder after each ex losion and before another as admission.

CHARLES LATTA. 

